They will be joined on the cross-country trek by some of United's World Cup players, including Wayne Rooney (England), David De Gea (Spain), Shinji Kagawa (Japan) and Juan Mata (Spain).

England full-back Shaw, who turns 19 on Saturday, joined United from Premier League rivals Southampton last month. Herrera joined from Athletic Bilbao, also in June.

"We're delighted to have such a strong travelling squad for our pre-season tour to the United States," said assistant manager Ryan Giggs.

"These tours give the squad a great opportunity to not only prepare physically for the season ahead, but to bond as a group - something that is even more significant with the new manager and players coming in," he added.

The team depart for the tour on July 18 with the first match against Major League Soccer's LA Galaxy five days later.

United will open the International Champions Cup against AS Roma in Denver on July 27, play Inter Milan in Washington DC on July 29 and Real Madrid at the University of Michigan on August 2. The final is set for August 4.